Add Tanstack query to Invoicing dashboard (cache)

[aimensahnoun]

Sometimes, it takes a while to fetch requests, especially with the addition of encrypted requests.

Adding a Tanstack query would help us fetch the requests and then cache them, providing a better UX.

https://tanstack.com/query/latest/docs/framework/svelte/overview

[MantisClone]

This was fixed in #312